W91580 SERIES

24-MEMORY TONE/PULSE SWITCHABLE DIALER

WITH HANDFREE AND HOLD FUNCTIONS

Publication Release Date: Auguest 1995

- 1 -

Revision A3

GENERAL DESCRIPTION

The W91580 series dialers are Si-gate CMOS IC tone/pulse switchable dialers containing a 24-
channel automatic dialing memory, including a 16-digit

3 emergency dialing memory, a 16-digit

20 channel repertory memory that provides one-touch and three-touch dialing, and a 32-digit mercury
memory. These dialers also provide flash, clear, hold, and one-key redial functions.

FEATURES

DTMF/Pulse switchable dialer

31/32-digit LNB (last number buffer) memory (tone/pulse mode)

31/32-digit mercury memory (tone/pulse mode)

15/16-digit

3 one-touch direct repertory memory (tone/pulse mode)

15/16-digit

20 direct or indirect repertory memory (tone/pulse mode)

Uses 9

5 keyboard

Flash time: 98 mS, 305 mS, or 600 mS (selectable by keypad option)

Pause time: 3.6 sec.

Pause and P

T (pulse-to-tone) can be stored as a digit in memory

Minimum tone output duration: 100 mS

Minimum intertone pause: 100 mS

On-chip power-on reset

Uses 3.579545 MHz crystal or ceramic resonator

Packaged in 22, 24, or 28-pin plastic DIP

The different dialers in the W91580 series are shown in the following table:

TYPE NO.

PULSE

(ppS)

MEMORY

MERCURY

MEMORY

HOLD

HANDFREE

PACKAGE

W91580

W91580A

Yes

W91580B

10/20

Yes

W91580C

10/20

Save

Yes

W91580 SERIES

- 2 -

PIN CONFIGURATIONS

MODE

DTMF

VDD

VSS

T/P MUTE

HKS

DP/C9

MODE

DTMF

HFO

VDD

VSS

T/P MUTE

HFI

HKS

DP/C9

MODE

DTMF

VDD

VSS

DP/C9

HKS

HFO

T/P MUTE

HFI

DRS

HPM MUTE

W91580

W91580A

W91580B/C

PIN DESCRIPTION

SYMBOL

22-PIN

24-PIN

28-PIN

I/O

FUNCTION

Column-

Row

Inputs

The keyboard input may be used with either the
standard 9

5 keyboard or an inexpensive

single contact (form A) keyboard. Electronic
input from a

C can also be used.

A valid key entry is defined by a single row
being connected to a single column.

XT, XT

9, 10

11, 12

I, O

A built-in inverter provides oscillation with an
inexpensive 3.579545 MHz crystal or ceramic
resonator.

T/P MUTE

The T/P MUTE is a conventional CMOS
N-channel open drain output.
The output transistor is switched on during pulse
and tone mode dialing sequence and flash
break. Otherwise, it is switched off.

HPM

MUTE

The HPM MUTE is a conventional inverter
output. During pulse dialing, flash, hold, and
mercury mute functions, this pin will output an
active high. It remains in a low state at all other
times.

W91580 SERIES

Publication Release Date: Auguest 1995

- 3 -

Revision A3

Pin Description, continued

SYMBOL

22-PIN 24-PIN 28-PIN

I/O

FUNCTION

MODE

Pulling mode pin to V

places the dialer in tone

mode.
Pulling mode pin to V

places the dialer in pulse

mode (10 ppS, M/B = 2:3).
Leaving mode pin floating places the dialer in
pulse mode (10 ppS, M/B = 1:2).

HKS

Hook switch input.
HKS = 1: On-hook state. Chip in sleep mode, no
operation.
HKS = 0: Off-hook state. Chip enabled for normal
operation.
HKS pin is pulled to V

by internal resistor.

DP /C9

N-channel open drain dialing pulse output
(see Figure 1).
Flash key causes DP to go active when in pulse
mode and tone mode.

No connection.

DTMF

In pulse mode, remains in low state at all times. In
tone mode, outputs a dual or single tone. Detailed
timing diagram for tone mode is shown in Figure 2.

OUTPUT FREQUENCY

Specified

Actual

Error %

697

770

852

941

1209

1336

1477

699

766

848

948

1216

1332

1472

+0.28

-0.52

-0.47

+0.74

+0.57

-0.30

-0.34

DD,

16, 8

18, 8

20, 10

Power input pins.

W91580 SERIES

- 4 -

Pin Description, continued

SYMBOL

22-PIN 24-PIN 28-PIN

I/O

FUNCTION

HFI, HFO

12, 13

14, 15

I, O

Handfree control pins. A low pulse on the HFI
input pin toggles the handfree control state. The
status of the handfree control state is described by
the following table:

CURRENT STATE

Hook SW.

On Hook

Off Hook

On Hook

Off Hook

HFO

Low

High

Low

High

Input

Off Hook

On Hook

HFO

High

Low

High

Dialing

Yes

NEXT STATE

HFI

Low

HFI pin is pulled to V

by internal resistor.

Keytone signal output. A keytone will be generated
whenever a valid key is pressed. Frequency is 600
Hz and duration is 35 mS.

DRS

Dial rate selection.
This pin is pulled to V

by an internal resistor.

DRS

MODE

PIN

TONE/PULSE

DIAL

RATE

M/B

Floating

Pulse

Tone

Pulse

Tone

10 ppS

20 ppS

1:2

2:3

W91580 SERIES

Publication Release Date: Auguest 1995

- 5 -

Revision A3

BLOCK DIAGRAM

MODE

ROW

(R1 to R5)

COLUMN

(C1 to C8)

DTMF

ROW & COLUMN

PROGRAMMABLE

COUNTER

SYSTEM CLOCK

GENERATOR

DATA LATCH

& DECODER

KEYBOARD

INTERFACE

D/A CONVERTER

HKS

HFI

CONTROL

LOGIC

CONTROL

LOGIC

PULSE

LOCATION

LATCH

RAM

READ/WRITE

COUNTER

HFO

DP/C9

T/P MUTE

DRS

HPM MUTE

FUNCTIONAL DESCRIPTION

Keyboard Operation

DP /C9

M00

M05

M10

M15

EM1

MEMO

M01

M06

M11

M16

EM2

CLR

M02

M07

M12

M17

EM3

*/T

R/P

M03

M08

M13

M18

M04

M09

M14

M19

*MER

MER

is for W91580B only; Fin W91580C this key performs

Save

function.

W91580 SERIES

- 6 -

S: Store function key

F1, F2, F3: Flash keys

R: One-key redial

H: Hold function key

DP /C9 : This key is connected to pin DP /C9 via a bipolar switching transistor and a diode.

M0j: Direct or indirect (MEMO + M0j = M1j) repertory memory

M1j: Direct repertory dialing

EMi: One-touch memory for emergency call

*/T: * & P

CLR: Clear key

R/P: Redial and pause function key

MER: One-touch memory for mercury code dialing

MEMO: Indirect repertory dialing function key

Note: Dn = 0 to 9, *, #, Mij = M00 to M19 (i = 0, 1; j = 0 to 9).

Normal Dialing

OFF HOOK

(or

ON HOOK

HFI

...

1. D1, D2, ..., Dn will be dialed out.
2. Dialing length is unlimited, but redial is inhibited if length exceeds 32 digits.

Redialing

OFF HOOK

...

BUSY, Come

ON HOOK

OFF HOOK

(or

ON HOOK

HFI

R/P

ON HOOK

HFI

...

, BUSY,

HFI

Come

HFI

R/P

The

R/P key can execute the redial function only as the first key-in after off-hook; otherwise, it will

execute the pause function.

OFF HOOK

(or

ON HOOK

HFI

...

a. The one-key redial function timing diagram is shown in Figure 4.

b. If dialing

is completed, pressing the

R key will cause the pulse output

pin to go low for 2.2 seconds. Break time and a 600 mS pause will automatically be added.

If the

R key is pressed before the pulses for the number dialed out are completed, it will be

ignored.

W91580 SERIES

Publication Release Date: Auguest 1995

- 7 -

Revision A3

Number Store

OFF HOOK

(or

ON HOOK

HFI

...

Mij

EMi

MER

D1, D2, ..., Dn will be stored in memory location but will not be dialed out.

R/P

and

*/T

keys can be stored as a digit in memory. In store mode

R/P

is the pause

function key.

The store mode is released after the store function is executed or when the state of the hook switch is
changed.

...

D1, D2, ..., Dn will be stored in memory location Mij and will not be dialed out.

...

MEMO

M0j

a. D1, D2, ..., Dn will be stored in memory location M10 to M19 and will not be dialed out.

b. MEMO + M0j = M1j.

OFF HOOK (or ON HOOK

HFI

...

, Mn

( or

Ln ),

ON HOOK

a. D1, D2, ..., Dn will be stored in memory location and will be dialed out.

b. The

key must be pressed after completion of the dialing sequence.

...

D1, D2, ..., Dn will be stored in memory location Mij and will be dialed out.

...

MEMO

M0j

a. D1, D2, ..., Dn will be stored in memory location M10 to M19 and will be dialed out.

b. MEMO + M0j = M1j.

Repertory Dialing

OFF HOOK (or ON HOOK

HFI

Mij

EMi

MER

OFF HOOK (or ON HOOK

HFI

MEMO

OFF HOOK (or ON HOOK

HFI

MEMO

M0j

Access Pause

W91580 SERIES

- 8 -

OFF HOOK

(or

ON HOOK

HFI

R/P

...

1. The pause function can be stored in memory.

2. The pause function is executed in normal dialing, redialing, or memory dialing.

3. The pause function timing diagram is shown in Figure 5.

Pulse-to-Tone (*/ T)

OFF HOOK

(or

ON HOOK

HFI

...

*/T

D1'

D2'

...

Dn'

1. If the mode switch is set to pulse mode, then the output signal will be:

D1, D2, ..., Dn, Pause (3.6s) , D1', D2', ..., Dn'

(Pulse)

(Tone)

2. If the mode switch is set to tone mode, then the output signal will be:

D1, D2, ..., Dn, * , D1', D2', ..., Dn'

(Tone)

(Tone) (Tone)

3. The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse

mode only by going on-hook.

4. The P

T function timing diagram is shown in Figure 6.

5. */ T key can be stored as a digit in memory

Flash (F = F1, F2, F3)

OFF HOOK

(or

ON HOOK

HFI

1. Flash key cannot be stored as a digit in memory, and it has first priority among keyboard functions.

2. The system will return to the initial state after the break time is finished.

3. The flash function timing diagram is shown in Figure 7.

Clear key

CLR

R/P

(or

)

Redial and one-key redial buffer will be cleared.

CLR

Mij

Location Mij buffer content will be cleared.

CLR

Location Mij buffer content will be cleared.

CLR

MEMO

M0j

Location M1j buffer content will be cleared.

Save

W91580 SERIES

Publication Release Date: Auguest 1995

- 9 -

Revision A3

OFF HOOK

(or

ON HOOK

HFI

), D1, D2,

...

SAVE

D1, D2,

...

, Dn will be stored in save memory and dialed out.

OFF HOOK

(or

ON HOOK

HFI

, D1, D2,

...

, Dn

SAVE

D1, D2,

...

, Dn will be stored in save memory but will not be dialed out.

CHAIN DIALING

Relationship between the memory and the chain dialing buffer:

Memory

Digit

Location

M00

.
.
.

M01

.
.
.

M18

M19

M20

EM1

EM2

EM3

Normal Dialing

Section 1

Section 2

Section 3

Section 4

Chain Dialing Buffer

.
.

.
.
.
.

.
.

The chain dialing buffer may be divided into four sections, allowing up to four numbers to be dialed
out in sequence. For example, if the user enters M01, M03, EM1, and normal dialing (manual dialing),
the content of sections 1 to 4 will be M01, M03, EM1, and normal dialing (manual dialing). When
numbers are entered into the chain dialing buffer, there is no need to wait until the previous dialing
sequence has been completed. Numbers may be entered directly, one after the other, even while
previous numbers are being dialed out.

Manual Dialing

Repertory Dialing

Redial buffer content = Manual dialing + Repertory dialing.

Repertory Dialing

Manual Dialing

Redial buffer content = Repertory dialing + Manual dialing.

W91580 SERIES

- 10 -

Repertory Dialing

Redial buffer content = Repertory dialing + Repertory dialing.

Redialing

Manual Dialing

Redial buffer content = Redialing + Manual dialing.

The primary redial content may not be manual dialing. Otherwise, the last redial content will be
overwritten.

Redialing

Repertory Dialing

Redial buffer content = Redialing + Repertory dialing.

Redialing is valid only as the first key-in after off-hook or after the handfree dialing function is
toggled on.

The second sequence should not be performed until the first sequence is completely dialed out.

Manual Dialing

One Key Redialing

Redial buffer content = Manual dialing.

The one-key redial may only be used after dialing out of a manual dialing sequence is completed.

Repertory Dialing 1 (M1)

One Key Redialing

Repertory Dialing 2 (M2)

One Key Redialing

Repertory Dialing 1 (M1)

One Key Redialing

Repertory Dialing 2 (M2)

ON HOOK

OFF HOOK

Redialing

M1 and M2 represent any of the repertory dialing memories.

The first redialing will dial out M1; the second will dial out M1, M2.

If dialing out of the repertory dialing memories has not been completed, the one-key redial key will
be ignored.

Dialing of the second repertory dialing memory (M2) should not be performed until the one-key
redialing operation is completed.

Notes:

1. Chain dialing (cascaded dialing) allows for memory or manual dialing while a previous dialing sequence is still being dialed

out.

2. More than one sequence of manual dialing is not permitted.

Entering more than one manual dialing sequence will inhibit redialing.
Chain dialing of more than four sections is not permitted.

Manual Dialing

(two sections of manual dialing)

3. If more than four sections are entered, all sections after the fourth section will be ignored and redialing will be inhibited.

Manual Dialing

(over 4 sections, ignore

and inhibit redial)

4. There is a 2.0 sec. inter-chain dialing pause for cascaded dialing.

W91580 SERIES

Publication Release Date: Auguest 1995

- 11 -

Revision A3

MERCURY DIALING

1. Up to 32 digits may be stored.

2. Mercury dialing is activate only as the first key-in after off-hook or when handfree dialing is

activated.

3. The timing diagram for the mercury memory function is shown below.

IDP

DTMF

OSC.

KEY IN

MER

HPM MUTE

OSCILLATION

T/P MUTE

Mercury Function Timing Diagram

ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

RATING

UNIT

DC Supply Voltage

-0.3 to +7.0

Input/Output Voltage

-0.3

+0.3

-0.3

+0.3

Power Dissipation

120

Operating Temperature

OPR

-20 to +70

Storage Temprature

STG

-55 to +125

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.

W91580 SERIES

- 12 -

DC CHARACTERISTICS

= 2.5V, F

OSC

. = 3.58 MHz, T

= 25

C, All outputs unloaded)

PARAMETER

SYM.

CONDITIONS

MIN. TYP.

MAX.

UNIT

Operating Voltage

2.0

5.5

Operating Current

Tone

0.3

0.5

Pulse

0.15

0.3

Standby Current

HKS = 0,
No load & No key entry

Memory Retention Current

HKS = 1, V

= 1.0V

0.2

DTMF Output Voltage

Row group, R

= 5K

130

150

170

Vrms

Pre-emphasis

Col/Row, V

= 2.0 to 5.5V

DTMF Distortion

= 5 K

, V

= 2.0 to 5.5V

-30

-23

DTMF Output DC Level

TDC

= 5 K

, V

= 2.0 to 5.5V

1.0

3.0

DTMF Output Sink Current

= 0.5V

0.2

DP Output Sink Current

= 0.5V

0.5

T/P MUTE Output Sink
Current

= 0.5V

0.5

HPM MUTE Output Sink
Current

HPML

= 0.5V

0.5

HPM MUTE Output Drive
Current

HPMH

= 2.0V

0.5

HKS I/P Pull High Resistor

300

Key Tone Output Current

KTH

= 2.0V

0.5

KTL

KTH

= 0.5V

0.5

HFO Drive/Sink Current

HFH

= 2.0V

0.5

HFL

= 0.5V

0.5

Keypad Input Drive Current

= 0V

Keypad Input Sink Current

= 2.5V

200

400

Keypad Resistance

5.0

AC CHARACTERISTICS

W91580 SERIES

Publication Release Date: Auguest 1995

- 13 -

Revision A3

PARAMETER

SYM.

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Keypad Active in Debounce

KID

Key Release Debounce

KRD

Pre-digit Pause

PDP1

MODE Pin = V

10 ppS

MODE Pin = Floating

33.3

Pre-digit Pause

PDP2

MODE Pin = V

20 ppS

MODE Pin = Floating

16.7

Interdigit Pause (Auto dialing)

IDP

10 ppS

800

20 ppS

500

Make/Break Ratio

M/B

MODE Pin = V

40:60

MODE Pin = Floating

33:67

Tone Output Duration

Auto Dialing

100

Intertone Pause

ITP

Auto Dialing

100

Flash Break Time

305

600

Pause Time

3.6

Key Tone Frequency

600

Key Tone Duration

KTD

One-key Redialing Pause Time

600

One-key Redialing Break Time

2.2

Notes:

1. Crystal parameters suggested for proper operation are Rs < 100

, Lm = 96 mH, Cm = 0.02 pF, Cn = 5 pF, Cl = 18 pF,

OSC

. = 3.579545 MHz

0.02%.

2. Crystal oscillator accuracy directly affects these times.

W91580 SERIES

- 14 -

TIMING WAVEFORMS

KI
D

PD
P

ID
P

KI
D

ID
P

PD
P

LOW

OSCILLATION

ID
P

HKS

KEY IN

T/P MUTE

DTMF

HPM MUTE

OSC.

Figure 1. Pulse Mode Diagram (Normal Dialing)

HKS

KEY IN

T/P MUTE

KID

ITP

DTMF

KRD

KID

ITP

KRD

LOW

HIGH

LOW

HPM MUTE

OSC.

OSCILLATION

Figure 2. Tone Mode Diagram (Normal Dialing)

W91580 SERIES

Publication Release Date: Auguest 1995

- 15 -

Revision A3

Timing Waveforms, continued

ON HOOK

HKS

OFF HOOK

HFI

HFO

LOW

HIGH

T/P MUTE

HPM MUTE

CHIP ENBLE

H KEY

Figure 3(a).

Note: H KEY cannot be enabled when chip is disabled.

OFF HOOK

HKS

HFI

H KEY

HFO

HIGH

T/P MUTE

HPM MUTE

CHIP ENBLE

Figure 3(b).

Note: The HFI and H KEY inputs will toggle the HFO signal; as soon as either HFI

H KEY is activated, the HFO signal

will go high and previous inputs will be ignored.

W91580 SERIES

- 16 -

Timing Waveforms, continued

ON HOOK

HKS

HFI

H KEY

HFO

HIGH

T/P MUTE

HPM MUTE

CHIP ENBLE

Figure 3(c).

Note: Changing the state of the HKS signal from high to low will initialize the HFO and HPM MUTE signals.

LOW

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

LOW

HPM MUTE

DTMF

OSC.

OSCILLATION

Figure 4. Pulse Mode One-key Redialing Timing Diagram (when not first key)

W91580 SERIES

Publication Release Date: Auguest 1995

- 17 -

Revision A3

Timing Waveforms, continued

R/P

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

PDP

LOW

HPM MUTE

DTMF

OSC.

OSCILLATION

IDP

Figure 5. Pause Function Timing Diagram

*/T

HKS

KEY IN

T/P MUTE

KID

PDP

IDP

HPM MUTE

DTMF

OSC.

OSCILLATION

IDP

Figure 6. Pulse-to-Tone Function Timing Diagram

W91580 SERIES

Publication Release Date: Auguest 1995

- 19 -

Revision A3

Headquarters

No. 4, Creation Rd. III,
Science-Based Industrial Park,
Hsinchu, Taiwan
TEL: 886-3-5770066
FAX: 886-3-5792697
http://www.winbond.com.tw/
Voice & Fax-on-demand: 886-2-7197006

Taipei Office

11F, No. 115, Sec. 3, Min-Sheng East Rd.,
Taipei, Taiwan
TEL: 886-2-7190505
FAX: 886-2-7197502

Winbond Electronics (H.K.) Ltd.

Rm. 803, World Trade Square, Tower II,
123 Hoi Bun Rd., Kwun Tong,
Kowloon, Hong Kong
TEL: 852-27516023
FAX: 852-27552064

Winbond Electronics North America Corp.
Winbond Memory Lab.
Winbond Microelectronics Corp.
Winbond Systems Lab.

2730 Orchard Parkway, San Jose,
CA 95134, U.S.A.
TEL: 1-408-9436666
FAX: 1-408-9436668

Note: All data and specifications are subject to change without notice.

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